<demo>标题部分插入自定义内容</demo>
<template>
  <lc-dropdown>
    <template v-slot:title>
      <lc-button type="primary">
        <span>更多菜单</span>
        <lc-icon class="lc-icon-arrow-down"></lc-icon>
      </lc-button>
    </template>
    <lc-dropdown-item>新闻专栏</lc-dropdown-item>
    <lc-dropdown-item disabled><a href="#">反馈管理</a></lc-dropdown-item>
    <lc-dropdown-item>退出登录</lc-dropdown-item>
  </lc-dropdown>
</template>
